Question { NCC, 38024 }

DIFFERENCE BETWEEN POWER AND CONTROL CABLES

Answer

According to cable types and size
1Cx2.5sq.mm to 4CxMax. Sq mm - Power cables

3Cx1.5sq.mm to 27Cx2.5sq.mm-Control Cables

Control Cables are available in 1.5sq.mm and 2.5sq.mm-Only
in Cu.
Power Cables are available from 1Core to 4Core and 2.5sq.mm
to 630sq.mm in Al. and Cu

Power cable is connecting the Power circuit. whereas control
cables is connecting the control circuit.

Question { VHB Medi Life Sciences, 46718 }

Difference Between Isolator and Mcb

Answer

Isolator is opens the supply line at both ends (In and out
terminals)so the supply line is disconnected at both ends
MCB is open at one side only

__ \__ ----o / o----
In out
MCB Isolator when it opens

Question { 5558 }

how steam converted into electricity in power plant

Answer

High pressure steam , produced by the boiler is fed to the
steam turbine blades through nozzle it tends to rotate the
turbine. In other end of the turbine generator is coupled.
when turbine rotates at the same time generator is also
start rotating. And the Electrical Energy is produced by the
generator.

Question { Essar, 9817 }

what is lightning arester?generaly which type of used in
industeries? why its used?

Answer

Lightning arrester is the device to protect the Equipments
and buildings which is located in very hight. Lightning
stoke is attack the tallest point in the area. So we are
mounting the lightning arrester at the highest level and it
will grounded through proper arrangements and accessories.
Mostly GI is used and the best one is copper arrester. This
copper or GI is connected with downleads or down conductor
and it terminates to the Lightning Earth pit. To avoid the
lightning damages we are using the lightning protection system.

Question { 11615 }

Why the resistance grounding (NGR) is better than Solid
grounding?

Answer

No it is because of Arcing.